Singlet fermionic dark matter as a natural higgs portal model

TL;DR

This paper introduces a renormalizable fermionic dark matter model where a singlet Dirac fermion interacts with the standard model via a singlet scalar that mixes with the Higgs, explaining relic abundance and predicting direct detection signals.

Contribution

It presents a novel minimal model of fermionic dark matter with a singlet scalar portal, providing a natural WIMP candidate and analyzing collider and direct detection implications.

Findings

Relic abundance of dark matter can be explained within the model.

Predicted elastic scattering cross section constrains model parameters.

Collider signatures of the singlet scalar are discussed.

Abstract

We propose a renormalizable model of a fermionic dark matter by introducing a gauge singlet Dirac fermion and a real singlet scalar. The bridges between the singlet sector and the standard model sector are only the singlet scalar interaction terms with the standard model Higgs field. The singlet fermion couples to the standard model particles through the mixing between the standard model Higgs and singlet scalar and is naturally a weakly interacting massive particle (WIMP). The measured relic abundance can be explained by the singlet fermionic dark matter as the WIMP within this model. Collider implication of the singlet fermionic dark matter is also discussed. Predicted is the elastic scattering cross section of the singlet fermion into target nuclei for a direct detection of the dark matter. Search of the direct detection of the dark matter provides severe constraints on the parameters of our model.